Bickers (6)
I believe the answer is:
argues
'bickers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for argues that I've seen before include "Disputes, proposes the contrary" , "Disputes, expresses disagreement" , "Contends, debates" , "Debates or bickers" , "Disputes, contends verbally" .)